I would go with the 200 gr SST or Shockwave with the blue sabots. I use them with 80 gr of Blackhorn and the gun is easily shot by a 7 yr old. He even said it feels like shooting the 22 but a lot more noise. lol With 100 gr you can extend your range. More than that your just wasting powder I would think.

You can use the 200 gr 10mm XTP but don't push it too fast. It will come apart on a shoulder hit. The Shockwave is more durable.